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True Zero Order Waveplate

True zero-order waveplate is an ideal case of optical waveplate. True zero-order
waveplates are so thin that the optical phase delay between the two polarizations
is just 90° for quarter waveplate, and 180° for half waveplate. True zero-order
waveplate is now widely used in laser Lab and optical instrument.

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Features of True Zero-order Waveplate

Comparing Multi-order, Zero-order & True zero-order waveplate

Multi-order waveplate, Zero order waveplate and True zero order waveplate are
interchangeable for most of applications. For some critical applications, Zero
order waveplate and True zero order waveplate should be considered. The advantages
of zero-order waveplate are an increased bandwidth and a lower sensitivity to
temperature changes.

However, the normal two plates design Zero order waveplate has
a relatively larger thickness which reduces the field angle. For the
applications where a large field angle is necessary, such as imaging systems, true zero order waveplate
gives the solution. These true zero order waveplates are made of a very thin plate
or cemented with a BK7 substrate, which ensures the best possible field
angle, temperature and wavelength performance.

The following table gives the comparison of low order waveplate, zero order waveplate
and true zero order waveplate(based on 1/2 @1064nm with 1/100 retardation variation):